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Satellite & Communication Udit Gupta
Welcome to the 1st lesson. Today we will talk about an Basic communication system, transmitter, receiver, communication channel and modulation Don't forget to check the SPECIAL CLASSES aunacademy.com/plus.
Basic Communication System A basic communication system consists of an information source, a transmitter, a link and a receiver The transmission of information can only occur when sender and receiver understand a common language. Link Source of information TransmitterReceiver Output signal (Channel)
Transmitter In radio transmission, the transmitter consists of a transducer, modulator amplifier and transmitting antenna Transducer: Converts sound signals into electric signal. Modulator: Mixing of audio electric signal with Amplifier: Boosting the power of modulated signal. Antenna: Signal is radiated in the space with the aid of an antenna. high frequency radio wave Antenna Transducer | Modulator Amplifier Transmitter
Communication Channel The function of communication channel is to carry the modulated signal from transmitter to receiver. The communication channel is also called transmission medium or link.
Receiver The receiver consists of antenna, demodulator, amplifier and transducer. Pickup Antenna: To pick the signal Demodulator: To separate out the audio signal from the modulated signal Amplifier: To boost up the weak audio signal Transducer: Converts electric Signal into audio signal. iAntenna Demodulator Amplifier Transducer Receiver
Modulation The process of superposition of a low frequency (LF) signal over the high frequency (HF) signal is known as modulation. : Need for Modulation: Digital and analog signals to be transmitted are usually of low frequency and hence cannot be transmitted to long distances. Height of antenna: For efficient radiation and reception, the height of the transmitting and receiving antennas should be comparable to a quarter of wavelength of the frequency used.
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